content: convert SSL notifications to observer usage

chrome/browser/ssl/ssl_blocking_page.cc

Index: chrome/browser/ssl/ssl_blocking_page.cc
diff --git a/chrome/browser/ssl/ssl_blocking_page.cc b/chrome/browser/ssl/ssl_blocking_page.cc
index f292e627156b42f93b3e3ab15ec35dd10b8ca1d5..05d030a78e5567a4f13c250387434f3902bb3500 100644
--- a/chrome/browser/ssl/ssl_blocking_page.cc
+++ b/chrome/browser/ssl/ssl_blocking_page.cc
@@ -326,10 +326,7 @@ void SSLBlockingPage::OverrideEntry(NavigationEntry* entry) {
   entry->GetSSL().cert_id = cert_id;
   entry->GetSSL().cert_status = ssl_info_.cert_status;
   entry->GetSSL().security_bits = ssl_info_.security_bits;
-  content::NotificationService::current()->Notify(
-      content::NOTIFICATION_SSL_VISIBLE_STATE_CHANGED,
-      content::Source<NavigationController>(&web_contents_->GetController()),
-      content::NotificationService::NoDetails());
+  web_contents_->NotifyVisibleSSLStateChanged();
 }
 
 // Matches events defined in ssl_error.html and ssl_roadblock.html.